Angles and shapes

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Across
  1. 2. 180 degrees = ?
  2. 3. An angle larger than 180 degrees but smaller than 360 degrees.
  3. 6. A regular quadrilateral with four internal right angles.
  4. 7. CM
  5. 8. A 2D shape whose internal angles equal 180 degrees.
  6. 9. A 2D shape with no straight sides.
  7. 13. The distance around a closed 2D shape.
  8. 14. The space inside a closed 2D shape.
  9. 15. A six sided 2D shape.
  10. 16. An angle larger than 90 degrees but smaller than 180 degrees.
Down
  1. 1. MM
  2. 4. A tool for measuring angles.
  3. 5. An angle smaller than 90 degrees.
  4. 10. An eight sided 2D shape.
  5. 11. A five sided 2D shape.
  6. 12. 90 degrees = ?